A drug RCMP say is 100 times stronger than fentanyl has made its way into a Saskatchewan prison.

A Health Canada test recently confirmed carfentanil was found in a substance connected to an overdose at Saskatchewan Penitentiary last month, according to police.

A 22-year-old man, an inmate, was found unresponsive at the prison July 15. The overdose was not fatal, but naloxone was administered and the man was taken to hospital.

It’s the first time carfentanil has been confirmed within Saskatchewan RCMP’s jurisdiction, Mounties say.

The drug, an opioid, is normally used to sedate large animals like elephants.

An amount weighing less than a grain of salt can be fatal, and a single dose of naloxone may not be enough to help an overdose victim, according to RCMP.